spectacular art, game design, and sense of humor. seeing the result of combinations made me happy, especially when it wasn't what i expected it to be (my favorite was the "toggle"). this is one of my favorites and i think that you absolutely knocked it out of the park.
i can't add much more than what BlackVoidMedia suggested, but if i could throw in the smallest, most inconsequential thing that i noticed: i expected the merge indicator to be Current/Required rather than Required/Current (e.g. 4/2 for 4 required merges, 2 already completed).